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Have a look at the main wire that comes from the battery, sometimes they run from the battery to a conector that corodes and then you loose all the power to the fuse box, that same bad conection can cause the alternator not to charge the battery and than you replace the alternator not fixing the route cause

It should be fuse #36 (10 amp) in the box under dash. Its marked illum. lights. If it was blown and it blows again after you replace it you have a short somewhere in the circuit. P.S. your owners manual should give you fuse locations.

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No. Dash lights being out could be a bad headlight switch, since the dash lights are routed through the headlight switch, not the dimmer switch. Park and tail lights also controlled by the headlight switch.

Lights and electrical circuits are sometimes in pairs so that you notice something is wrong (tail lights and dash). On a '90 merc grand marq., that would be fuse #4,the 15 amp blue one, in the panel next to your left foot. If you are lucky,itjust failed from age. If you are not lucky, there is a short in the system containingthe dash, tail,parking,side marker, license lamps and trailer tow relay if equiped.I had to replace the push/pull main light switch which was shorted. If you are lucky, just replacing the fuse in the panel will do it. Referance Grand Marquis Owners Manual for fuses and function.

when you open door does over head light go on? it thinks it fuse 11 its underdash if its good then you just need someone to help out step on brakes put ebrake on and try to shift out,
thats if the fuse under dashes is good

Check all the bulbs at tail end for parking and brakes, test grounds and harness for trailer. Check fuses. clean batery terminals, Re instal head light swich properly and make sure all wires conect.
Vitally

THIS WOULD HAVE NOTHING TO DO WITH THE DASH LIGHTS... WHEN YOU TURNN ON YOUR PARKING LIGHTS YOU SEND POWER STRIEGHT FROM HEADLIGHT SWITCH TO THE DASH...NEED TO RECHECK PARK LIGHT FUSE...IF GOOD THE BAD HEAD LIGHT SWITCH SOUNDS MOST LIKELY